Incandescent electric lamp.



o. PARKAS & H. J. JAEGER.

INCANDESCBNT ELECTRIC LAMP.

APPLICATION FILED .4116.24. 1908.

Patented Sept. 7, 1909.

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,STATES 'CARL 'MRKASLAND HERMANJQJAEGE'R. 'or newA Yomr, N. Y.

J. vJliltorxn?A a citizen o'f the United States of Amerxea', bothresidents of 7New l ork, m the county and State of New York,

have invented certain 'new and useful 1m. provenientes m IncandescentElectric' Lamps, cf whlchthe following is'a specification.

'l si Thisinvention has reference to irnl'n'ove-A ments 1n incandescentlamps.

It ertains' particularly to that type-ofineen es'cent' lamps `containinge so called metallic filament of reltively great length 'i n, relativelylai embodied in e. glass .lobe'of usualy si'ze und having a number'ofoops all in series with each other. 'Thus ,the single [loops of thefilament formo'ne continuous single conductor requiring butvtwo'leading-1n wires asin anyV ordinary multiple'arclam Theselon'g 1netallic filaments, as iswell) k consume but very little current sindpresent e' light emittili surface.

Such lon metal ic filiiments'me'e, for instance, o chromium .expend bythe heat of the dectriccurrent VWhen-,the lulnpis lighted.

`aeh loop of the filament accordinglyg'ets d base et the top-.undthenthere is danger off twoneighbormg Eloops* coinin 'in contact. with eachother whereby the li :iui'entburns losin ,softensA Therefore lampscontainiu met lic filaments cannot besafely, burne exfce t whenhanging'eticallydownward with t e out, or one loop may touch the luss'wiill ofthe globe; breuk-ingenua."and esho'yin with the )ase at the bottom'tlledn'ger-of the' lamp is .so {n xuchi" greater.' l For" certainpurposeszit i'sdesirable or nccess'nry to mount the lamps s o that thefilament i's in a. horizontalposition. The abovedescribed lum Vscanot'be burned horizontally.

-' T e presentinvention. has for' its .object to pro ucc incandescent.lamps with su'ch long, economical, metallic 'lilamentsfmvhich muy beburned horizontally or .vertically with the base at-the bottom.. 4Forthis purpose flat, elastic fand conductivev supportsfl and flat elasticanchors are provided within the novel lamp. These supports are 'a'rrenin such manner that thejfree ends of t e single loops of the filamentmaybe;

cemented thereto so that all the 'loops are in series and form onecontinuous conductor while the elastic anchors support euch a loopSpectchtion of Letters Psi-tent. Application mea August 24, 190s. serialNo. 449,974).

4Beitknown lthat Wc, CAuL FA'RKAS., a citi-'- .zen o f the Kingdomof'Hungery, and HER- MAN nown,

Patenten sept. 7, moo.

proper. 4The llat metallic conductors and the flat elastic anchors areof novel'eonstruc'- tion.

protected against inu'ry und breakage when lnear expansion o the loopstakes place when thela'm'p 'is lighted. Lxexrse *fue sin' gle loops arep'otected n einst. tearing when.:

contraction t es place a ter-the current' has been turned oli.

"The invention is illustra.ted in the accom# panying drawing in which:

Figure 1 re resents in perspective view slit' incandescent amp withmetallic filament which embodies-in'desirable form the present'improvements; Fig.' 2 illustrates in top lan View the top' supportfor the filament oop'syand Fig. '3 is 'across section on lineav s, a ofFig.

Similar letters 'of 'reference denote like prts in all the figures. Theprotecting and supporting devices are By` virtue of the elasticit ofthese- 'devices the single loops of the li amen't are TENT orienten.

made of very thm, flat strips' of metal which.

may be secured to a glass rod by fusion in the same manner in which theleading-iii fwires are sealed into 'the stem. Accordingly these devices`are preferably .made of 'platmum' 'or letinum niclf'el Anlloy or otherl suitable, con uct'ive metal which isdnctile enough 'to' be formed'into very thin' sheets und Stripsnnd possesses the 'required el'as#t'city.

thelobe orvacuum chamber which usually .iso elong'raterl'orl 'pearslmpe,'b is the stem undcu-rryingthe lending-in Awires c,` d. A To 'thesolid top portion of the stem islfused n. thin Standardor post of lass,preferably 'a 'thin lass rod-.1 A snm-llgrim f is formed Qi'n tl'x owerportion of the standard. To thisrim are secured by fusion three flut'metallic conductors at e distance of 90 from' each other while'thewiresc, (l are bent horizontelly over in the free spaceoi the ;c1.rcleand in a horizontal lane' with the three conductors. Close, to t c topof the lass rod and formed into e short 'horizontal strip l 'I-lrFi.l'of'the drawing @represents 'l fused four ,dat elast-ic enc-hors.

sealed `into the globe in the usual manner tot llt:

plane at 90 apart. The anchors are not`.`

. arranged in the same vertical plane with the support j.

supports below, but in vertical planes between them for the reason whichwill be stated below. Each elastic anchor consists ofa dat horizontalstrip formed into a hook g as shown in Fig. 1. The anchors are made offlat elastic metal strips referably of platinum,'platinum alloys, nicel, aluminum,

or bronze, the strips from which they are made must be very thin, so. asto be elastic.

' Four filament loops are shown in Fig. 1 of the drawing in connectionwith the three elastic conductive supports and the four elastic anchors.The loops have lthe shape of a hair pin. They are narrow at. the top andthe free ends are relatively far apart. The free ends are cemented tothe metallic sup Orts andthe loo s hang in the hooks oft e anchors. Fort is reason-the anchors arenot? in the sa'me vertical planes with the.suppoi.`z ,Aeg-floops are' arranged as follows: 'HQI y'fr iscementedwith one free end tothellea ing-in wired, itpasses over the hook of theanchor m and its second free end is cemented to the neighboring'side endof the support h.. The loop s is cemented with one free end to thesecond side end of the. support h, it passes over the hook of therinchor n and it's second free end is cemented 4to one side end 'ofthe-support i. The loop t is cemented with one free end to the secondside end of the support i., it passes over the hook of the anchor o, andits second end is cemented to the neighboring 'side end of the The loopu is cemented withone way.

y, 1t runs down to the leading-'in wire c to 4.

which its second free endis cemented.

The filament loops cemented to th fiat elastic supports and hanginginthe hooks o-thenflat elastic anchors do not sag when linear eipansiontakes place during the burning -of the lain@ `'I "he hooks of theclasticanchors leave some rooxns'for expansion. When the current isturned`oiitl1e loops become cold and contraction sets i`x'1\ but the daner ofbreaking is avoided becanse the cod, stift' loops are protected bythe elastic supports which then slightly give lVe claim as ourinvention: I A An incandescent electric lamp with metallic filament,comprising a vacuiim chamber with stem and leading-in wires, a standardor post of nonsconductiv'e material secured to the top portion of thestem, a set of flat, T sha ed, elastic, conductive su (a.-

ports for the lament loops secured to tie bottom portion of thestandard, a-set of flat elastic anchors with hooks at the ends securednear the top end of the standard, and a metallic filament consisting offour loops hanging in the hooks of the elastic anchors and cementedalternately with their free ends to the leading-in wires and the freeside ends of the T sha ed supports so that the loops are connecte inseries. 7 In testimony whereof we have hereunto set our hands in thepresence of two subscribing witnesses. I

CARL FARKAS. ,l HERMAN JLVJAICGER.

Witnesses:

JACOB L. DIAMOND, G. ScnMALs'rEIK.

